The thyroid descends into the front of the trachea.

Cleft lip or palate may be due to genetic or environmental causes.

Mandibular clefts are far less common than maxillary clefts.

The oral pit is not known as the stomodeum.

The medial nasal process and the 2 maxillary segments eventually form the philtrum.

The six auricular hillocks form the ear.

If the mandibular arch does not lose its midline constriction, mandibular clefts are more likely to ensue.

An incomplete cleft palate means that there is a communication between the nasal cavity and the oral cavity.

Cleft lip and palate occurs in white females less than it does in white males.